Electric bell.



G.- H. NORTH. ELECTRIC BELL. APPLICATION If ILBD APB.22,1905.

Q8 g. t w w C 2 6 M p. am. m 54.2. n WM m IF-m WWE 3 K m r M 1A To allwhom it may concern:

TED ST TE-s PATENT OFFICE.

CHARLEs n. NORTH, OF CLEVELAND, oHIo, ASSIGNOR TOT'HE NORTH ELECTRICCOMPANY, 0F CLEVELAND, 91110, A CORPORATION OF 01110. a

ELECTRIC BELL.

Specification of Letters Patent.

Patented Oct. 27, 1908.

Application filed April 22, 1905. Serial No. 266,826.

Be it known that I, CHARLEs H. NORTH, a citizen of the United States ofAmerica, and a resident of Cleveland, in the county of Guyahoga andState of Ohio, have invented certainnew and useful Improvements inElectric Bells, of which the following is a specification.

My invention relates to improvements in electric bells, although some ofthe features thereof are not necessarily limited to this particular use.v

In perfecting myinvention, it has been my object to provide apparatus ofextremely simple and cheap construction, and particplarLV adapted tomeet the requirements of commercial use.

More in detail, it has been my, aim toefl'ect improvements in themounting of the armature and associated bell-tapper or other parts,-whereby the pivotal mountings of prior bells are avoided, and the deviceis made more sensitive in the response to suitable ringing currents.

In addition, certain features of its construction, render my improvedbell one that is readily altered to serve as a biased ringer, and it maybe adjusted to become responsive to selective signaling currents.lravinggiven characteristics or periods.

My improvements will be seen to comprise the mounting of the armaturedirectly upon scale bearings, or preferably, upon sets of scale-bearingsopposed by spring-actuated means, the same being accurately adjusted, toavoid any lost motion and minimize the friction. It has been commonexperience in the art that pivotally mounted armatureparts do notpresent such advantages, and it ias been my aim to overcome theinherentdisadvantages found in such structures, and improve otherwise'thereon.

The features of my improvements will be more;.readily grasped, by makingreference to tlie accompanying sheet of drawings, illustrating in detailan electric bell mechanism constructed in accordance with my invention,wherein Figure 1 is a'viewin elevation of the said 2 is a verticalsectional view throu 'h the center thereof. Fig. 3 is a detail of thelower portion, partially-broken away and sectioned, better toillustratethe bearing, and showing as we'll a biasing spring.

' armature.

Fig. 4 is a plan view of the supporting-yoke and bearing. Fig. 5 is asimilar View of the I have employed the same character of refer- 'enceto indleate SlIllllfli parts, in order to avoid any misconception orconfusion.

.An upper mounting-plate or frame a serves to carry the se eral parts ofthe structure. port the bells or gongs b, in position to be sounded bythe intermediatelypositioned bell-tapper 0, under the influence ofexciting electro-magnets. To the upper end of the central depending post(1, is secured. the per manent polarizing magnet e, which surrounds theoperative parts of the bell, as best shown in Fig. 2. The lower portionof said post d adjustably supports the yoke f, the armature g, and theouter scale-bearing h. The adjustment is obtained by means of the screwd, which enters said post, and forces these parts together against theten sion of an interiorly-positioned coiled spring i. .Upon the armatureis carried the said From this, uprights or posts I) sup bell-tapper c,mounted by means of its stem c on a laterallyrojecting portion of the Ana justable weight '7' is positioned upon the stem 0, being secured inplace by a small screw, This weight maybe used for adapting the bell tothe purpose of selective signaling, a) increase the impact of "thebell-tapper, or it may be omitted altogether.

" Beneath the head of the screw 61, I may secure a spring 7r, bearingupon one side or the other of the oscillating armature, and.

thereby provide the simple means shown in Fig. 3 for giving bias to thebell. This flat spring Zc may be swung beneath the screw head, so as tobear upon either end of the armature, and adjust the bias thereof toeither side, thus avoiding any change or crossing of the connectionsafter the bell is installed. In Fig. 7,1 have shown a modifiedbiasing-spring 7c, which is the tension of said spring as required.

'-In additiongthere are shown further modified features in that thearmature itself is rovided with an adjusting-screw k adapts tovaryemployed to secure selective actuation.

Saidf armature is made, much larger and heavier, and is tapped-at g toreceive weights m, which may be adjusted in different positio'ns alongits length. This bell is adapted for use withheavy signaling currents,and some of itsparts, including the s ring i, are made heavier to adaptthe bell't ereto.

It will be understood that the weights and 'm may be made heavier orlighter to suit given conditions, and may be used together or alternatvely, as desired.

Each of the figures of the drawings illustrates some features of the imroved support or mounting for the be l-armature, which I will refer to alittle more in detail. The armature g is provided with off-set V- shapedrecesses g g in its u per and lower faces, which are in exact ainement.The usual pins g are inserted in its extremities for overcoming thetendency to stick to the magnet poles. The yoke f affords two 0 en ingsf, which slip loosely over the poles of the elcctro-magnets Z; said'yokebeing provided midway with two acute-angled or V-shapd bearing-points fSimilar bearing-points h are rovide'd upon the outer scale-bearing h.hese bearing-points respectively register with the recesses provided inthe armature, and mount the latter in an extremely sensitive mannerbefore the opposing oles of the electro magnet, and within the field ofthe permanent magnet, so that the armature maybe oscillated under theinfluence of a minimum current.

The screw (1 opposing the force of the coiled spring 6, operatively andadj ustably secures these parts together in a manner avoiding any lostmotion, and at the same time preventing the loosening of the armature.Moreover, the scale-bearings are held firmly in alinement by the spring,and the bell-tapper is thus afiorded a 'rigid, yet

easily actuated mounting, wherein to oscillate under the influence ofthe energized electro-magnets. Other means, however,

- may be employed instead of the spring, for

holding the bearings securely in alinement and in close engagement withthe armature.

The structure described will be found very advantageous, used eitherwith the biasing s ring, with the adjustable weight, or with t ese artsaltogether omitted; depending upon t e character of the circuit andringing current employed in conjunction therewith.

It will be ap reciated from a consideration of theforegoing, that theimproved mounting for the armature set forth, is one permitting thefreest play or oscillation thereof in any bell or similarelectro-Inagnetic appliance.

. Having now described the preferred em bodiment of my invention, andthe construction and operation thereof l claim as new, and desire tosecure by Letters Patent,

stantial] y as set forth.

2. In an electro-magnetic appliance, the

combination with the electro-ma net thereof,'of an oscillating armaturepositioned before its poles, scale-bearing parts engaging the outer andinner faces of said armature, an adjusting screw, and an opposing springinaintainin said parts in operative relation, substantial y as setforth.

3. In an electro-magnetic bell, the combination withthe actuatingelectromagnet, of an armature mounting the 'bell-ta per, a mounting forthe armature avoiding ost 'motion and ermitting its free oscillat1onunder the impu se of the electro-magnet, and an adjustable weightslidably mounted upon the bell-tappcr for adapting the bell to selectiveactuation by predetermined currents, substantially as set forth.

4. In an electric bell of the class described,

"before its pole-pieces, a bell-tapper carried by the armature, innerand outer scale-bearings, and a spring and opposing adjustingscrew formaintaining the armature and its bearing-parts in close engagement,substantially as set forth.

6. The combination in'a selectively-actuated electric-bell, with theelectro-magnet traversed by the selective signaling current, anarmature, a bell-tapper carried thereby, an adjustable weight associatedwith the bell tapper, and a rigid oscillating-mounting for the armature,comprising inner and outer scale-bearings, an adjusting-screw and an'opposing spring maintainin the parts in c ose engagement, substantia lyas set forth.

7. The combination in a selectively-actuated electric-bell, with theelectro-magnet traversed by selective signaling currents, of arelatively heavy armature, a bell-tapper carried thereby, an adjustableweight associated therewith and also carried upon the armature,- andelevated scale-bearing parts and opposing means for mounting thearmature thereof, of an oscillating armature positioned 1 before theelectro-magnet to be actuated thereby, substantially as set forth.

8 In an e'lectro-magnetic appliance, the combination withelectro-magnets, of an at;-

mature mounted before the same and a bear ing for said armature,comprising outer and inner alined scale-bearing parts permitting thefree oscillation of the armature before the poles of the magnet, whileholding it firmlyin lace, substantially as set forth.

9. In a iased electro magnetic appliance, the combination withthefelectro-magnet 'beforeits poles, scale-bearing parts engaging theouter and inner faces of said armature, a

' biasing spring adapted to be brought into engagement with either endof said arma-' ture,- and means for securing said parts in closeoperative engagement, substantially as set forth( 10. In aselectivelyactuated signaling bell, the combination with its actuatingelecvtro magnet, of a relatively heavy armature I positioned before thesame, a bell-tapper carried thereby, adjustable weights adapted to besecured along the armature, and scalebearing parts engaging the outerand .inner faces of said armature to permit its free oscillation beforethe electro-mag'net, substantially as set forth. v

11. In an electro-magnctic ap liance, the combination with the actuatinge ectro-magnet, of a vibrating armature positioned before saidelectrdmagnt, scale-bearing parts engaging the inner and outer faces ofsaid armature, and means for retaining the scalebearings and armatureclosely in 'engagement and aline'ment, substantially as set forth.

- 12. Inan electro-magnetic' appliance of the class described',; thecombinat'lon'with the actuating electro-magnet thereof, of anoscillating armature positioned before its 'poles and centrall groovedor recessed, outer and inner scaleearing arts engaging therecessedarmature, an means for maintaining the armature and scale-bearingsclosely inanga 'ement and in proper alinement, substantiaIly as setforth. 1 13. In an electro-magnetic appliance, the combination with thedouble-pole electromagnet thereof, of an oscillating armature positionedbefore its poles, a scale-bearing for the armature, and aspring-mounting engaging said armature centrally to hold it securely inposition, but permitting its free oscillation, substantially as setforth.

14, In an electric bell adapted for alternating currents, thecombination with its electro-magnet, of an armature ositioned before theoles thereof, and carrying a belltapper, an a mounting for saidarmature, provided with scale-bearing parts, en aging said armature uponone of its faces at istant.

points approximating its full width and bearmg upon the other face aswell, for holding I the armature securely in position, substan tially asset forth.

15. In an electric bell'of the class described, the combination with theactuating electro-magnet, of an oscillating armature positioned beforeits pole-pieces, a bell-tap per carried bygzhe armature, inner :andouter ali'ned 56. 16 ari ture upon oife or t e either of its facessubstantially throughout its 'entire' width; and

means for maintaining saidarmature and itss engaging said arma'

